On3

3' Gauge rail modelling is a specialisation in rail transport modelling. Specifically it relates to the modelling of narrow gauge prototypes of 3 ft (914 mm) gauge. This gauge was the most common narrow gauge in the United States and in Ireland. Apart from some other lines in North, Central and South America, the 3 ft gauge was uncommon elsewhere. Therefore, most 3 ft gauge modellers model either United States or Irish prototypes.